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Sintra Weather in December
December in Sintra brings moderate temperatures, with daytime highs of 16°C (61°F) and nights around 12°C (54°F). Quite a bit of rainfall is expected, around 90 mm (3.5 in), so pack an umbrella.
Rainfall in Sintra in December
Historically, the month has about 14 days of rain, averaging 90 mm (3.5 in) in total. Rain this month is fairly typical, a standard mix of wet and dry days with no particularly heavy or persistent showers.
Temperature in Sintra in December
December in Sintra sees highs of 16°C (61°F) and lows of 12°C (54°F) overnight. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. At 12°C (54°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Sintra in December
The area enjoys a balanced 162 hours of sunlight, ensuring it's neither too overcast nor too sunny.December in Sintra can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Sintra Temperature in December
Min Temperature
12°C (54°F)
Max Temperature
16°C (61°F)
Chance of Rain
47%
Precipitation
90 mm (3.5 in)
Rainy days
14 days
Humidity
81% *
Sunshine
162 hours *
Percentage Sunshine
55% *
* Data from: Cascais, Portugal (11 KM, 7 Miles).
Sintra Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sintra - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sintra typically stay consistent throughout December, with daily highs averaging around 16°C (61°F). Nights are cool, with lows around 9°C (48°F).
Average temperatures in December
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather records for Sintra in December
Browse day-by-day weather records for Sintra spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sintra historical weather extremes in December
The extremes listed below come from historical weather data collected in Sintra from 1976 through 2025.
- The hottest December day on record in Sintra reached 23°C (73°F) (December 2, 1985).
- The coldest December day was on December 20, 2009, with a maximum of 7°C (45°F).
- The lowest overnight temperature recorded in December was -3°C (27°F) (December 5, 1998).
Best Places in Portugal in December
Find out more about the weather in Portugal and which places have the best travel conditions in this month. See all of Portugal in December →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Sintra in December
Pleasant temperatures in December mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. Bring sunglasses since you'll have some sunny periods throughout the month
What To Do in Sintra in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming5/10 -
Cycling6/10 -
Walking6/10 -
Barbeque6/10 -
Camping8/10 -
Outdoor sports9/10
Sintra 3-Day Forecast
More climate data for Sintra
Temperature Rainfall Sunshine Humidity
See the full Sintra climate overview or explore weather in Portugal.
Popular in December
Where to go in December - average daytime high across popular destinations.
Portimão
17°C (63°F) Albufeira17°C (63°F) Lagos17°C (63°F) Ericeira16°C (61°F) Cascais17°C (63°F) Vilamoura17°C (63°F) Lisbon16°C (61°F) Porto
15°C (59°F) Bucket list
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